Soft package PACK laser welding process optimization and improvement device

Abstract

An optimization and improvement device for a soft package PACK laser welding process belongs to the technical field of battery preparation, and adopts the scheme that a PCB (printed circuit board) positioning groove I and a plurality of battery cell guide comb teeth are arranged on a battery cell combing device, a PCB positioning groove II and a plurality of battery cell tab guide comb teeth are arranged on a battery cell tab combing device, and a PACK is placed in a PACK fixing device to be fixed and pressed; the battery cell combing device is located above the PACK fixing device, a plurality of battery cell guide comb teeth are correspondingly inserted into gaps between two adjacent soft package battery cells, the battery cell tab combing device is located above the battery cell combing device, and a plurality of battery cell tab guide comb teeth are correspondingly inserted into gaps between two adjacent soft package battery cell tabs; the PCB is located in the PCB positioning groove II, the tabs of the soft package battery cells are correspondingly inserted into the tab through holes in the PCB, the battery cell tab carding device is pulled out, the PCB moves downwards into the PCB positioning groove I, the bent tabs are welded to the nickel-plated copper bar on the PCB, and the battery cell carding device is pulled out.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery preparation, and in particular relates to a device for optimizing and improving the laser welding process of a soft pack PACK. Background Art

[0002] As the core power component of power battery systems, energy storage systems, communication systems, civil systems and other systems, the battery PACK module is of self-evident importance to electrical performance and safety. The PACK grouping method of the battery cell and the quality of the finished product directly affect the performance of the system.

[0003] Traditional soldering PACK modules require copper wrapping around the aluminum tabs, followed by ultrasonic welding. After ultrasonic welding, the tabs are then inserted into the PCB for soldering. This results in cumbersome assembly steps and high production costs. Furthermore, the average welding temperature is around 400°C, which can easily cause molten tin to splash, solidify into the cells, and pierce the cells, potentially causing tin beads to fall off during use, leading to short circuits. Currently, the new laser welding process lacks a fixture. Due to the numerous and thin tabs, bending and inserting them into the PCB is extremely difficult. This can lead to PCB bending during welding, laser focus shifting, resulting in cold joints, and slag splashing that can penetrate unprotected cells, posing a short circuit risk. Summary of the Invention

[0004] In view of the complicated steps of existing PACK soldering assembly, high production cost, short circuit caused by molten solder beads, long production time, and technical problems such as difficulty in piercing the tabs, welding slag splashing, and PCB bending in the latest laser welding process, the present invention provides a device for optimizing and improving the soft package PACK laser welding process.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A soft pack PACK laser welding process optimization and improvement device includes a PACK package fixing device, a battery cell combing device, a battery cell tab combing device and a PCB board; the battery cell combing device is provided with a PCB board positioning groove I and a plurality of battery cell guide comb teeth, the PCB board positioning groove I is located above the plurality of battery cell guide comb teeth, the battery cell tab combing device is provided with a PCB board positioning groove II and a plurality of battery cell tab guide comb teeth, the PCB board positioning groove II is located above the plurality of battery cell tab guide comb teeth, and a PACK package consisting of a plurality of soft pack batteries arranged together is placed on the PACK package fixing device The battery cell combing device is located above the PACK fixing device, and several battery cell guide comb teeth are correspondingly inserted into the gap between two adjacent soft-pack battery cells. The battery cell tab combing device is located above the battery cell combing device, and several battery cell tab guide comb teeth are correspondingly inserted into the gap between two adjacent soft-pack battery cell tabs. The PCB board is located in the PCB board positioning groove II and the tabs of each soft-pack battery cell are correspondingly inserted into the tab perforations on the PCB board. The battery cell tab combing device is pulled out, the PCB board is moved down to the PCB board positioning groove I, the bent tabs are welded to the nickel-plated copper bus on the PCB board, and then the battery cell combing device is pulled out.

[0007] Furthermore, the PACK fixing device includes a bottom plate, a door panel and three side panels, the door panel and the three side panels are vertically arranged above the bottom plate and surrounded by the periphery of the bottom plate, the three side panels are fixedly connected to the bottom plate, one side wall of the door panel is hinged to the adjacent side panel, and the other side wall is fixedly connected to the adjacent side panel via a quick clamp fixing device.

[0008] Furthermore, two adjacent soft-pack battery cells are fixedly connected using glue.

[0009] Furthermore, the bottom of the battery cell combing device also includes two positioning feet, and the two positioning feet are respectively located on both sides of a number of battery cell guide comb teeth. The positioning feet include a positioning plate and a positioning flange, and the positioning flange is fixed at one end of the positioning plate. The positioning plate and the positioning flange are respectively located on the outside of two adjacent side walls of the PACK package fixing device. The battery cell combing device also includes a handle I, and the handle I is fixed on the back side of a number of battery cell guide comb teeth.

[0010] Furthermore, a guide structure is provided at the tooth end of each battery cell guide comb tooth.

[0011] Furthermore, the battery cell tab combing device also includes a handle II, which is fixed on the back side of several battery cell tab guide comb teeth.

[0012] Furthermore, the tooth ends of the battery cell tab guide comb teeth are provided with chamfers II.

[0013] Furthermore, a nickel-plated copper busbar is provided between every two adjacent tab through-holes on the PCB board, and several nickel-plated copper busbars are connected to the collection terminal circuit through printed circuits on the PCB board.

[0014] Furthermore, handles are fixedly provided on two opposite side walls of the PACK fixing device, and the handles are provided with limiting convex edges.

[0015] Furthermore, the quick clamp fixing device includes a quick clamp tension and compression body and a quick clamp tension and compression hook, the quick clamp tension and compression hook is fixedly arranged on the door panel, the quick clamp tension and compression body is fixedly arranged on the side panel adjacent to the door panel, and the quick clamp tension and compression body and the quick clamp tension and compression hook are arranged correspondingly.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention greatly saves production costs, simplifies the manufacturing process, improves product quality, solves process problems such as solder molten beads piercing short circuits, welding slag splashing, PCB bending, and difficulty in piercing tabs, and optimizes and improves the laser welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the device for optimizing and improving the soft package PACK laser welding process proposed in an embodiment of the present invention;

[0019] Figure 2 This is an exploded diagram of the fixing device of the device for optimizing and improving the soft package PACK laser welding process proposed in an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of a cell combing device of a soft pack PACK laser welding process optimization and improvement device proposed in an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of a cell tab combing device of a soft pack PACK laser welding process optimization and improvement device proposed in an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of a PCB board of the device for optimizing and improving the soft package PACK laser welding process proposed in an embodiment of the present invention;

[0023] In the figure, 1. PACK package fixing device, 2. Battery cell combing device, 3. Battery cell tab combing device, 4. PCB board, 5. Soft-pack battery cell, 6. Quick clamp fixing device, 11. Bottom plate, 12. Door panel, 13. Side panel, 14. Handle, 21. PCB board positioning slot I, 22. Battery cell guide comb teeth, 23. Positioning support foot, 24. Handle I, 31. PCB board positioning slot II, 32. Battery cell tab guide comb teeth, 33. Handle II, 41. Tab perforation, 42. Nickel-plated copper busbar, 43. Printed circuit, 44. Collection terminal, 61. Quick clamp pulling and pressing body, 62. Quick clamp pulling and pressing hook, 63. Fixing plate, 221. Step structure, 222. Chamfer I, 231. Positioning plate, 232. Positioning flange, 321. Chamfer II. DETAILED DESCRIPTION

[0024] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] Example 1:

[0026] like Figure 1-5As shown, the present invention provides a soft pack PACK laser welding process optimization and improvement device, comprising a PACK package fixing device 1, a battery cell combing device 2, a battery cell tab combing device 3 and a PCB board 4; the battery cell combing device 2 is provided with a PCB board positioning groove I 21 and a plurality of battery cell guide comb teeth 22, the PCB board positioning groove I 21 is located above the plurality of battery cell guide comb teeth 22, and is used to position the PCB board 4; the battery cell tab combing device 3 is provided with a PCB board positioning groove II 31 and a plurality of battery cell tab guide comb teeth 32, the PCB board positioning groove II 31 is located above the plurality of battery cell tab guide comb teeth 32, and is used to position the PCB board 4; a PACK package consisting of a plurality of soft pack batteries 5 arranged together is placed in the PACK package fixing device 1, fixed and pressed, and the battery cell combing device 2 is located above the PACK package fixing device 1, and several battery cell guide comb teeth 22 are correspondingly inserted into the gap between two adjacent soft-pack battery cells 5. The battery cell tab combing device 3 is located above the battery cell combing device 2, and several battery cell tab guide comb teeth 32 are correspondingly inserted into the gap between two adjacent soft-pack battery cells 5. The PCB board 4 is located in the PCB board positioning groove II 31 and the tabs of each soft-pack battery cell 5 are correspondingly inserted into the tab perforations 41 on the PCB board 4. The battery cell tab combing device 3 is pulled out, and the PCB board 4 is moved down to the PCB board positioning groove I 21. The bent tabs are fitted with the nickel-plated copper bus 42 on the PCB board 4 and are welded by external laser. Under the action of the laser, the tab molecules and the nickel-plated copper bus 42 molecules are fused to form a whole. After welding is completed, the battery cell combing device 2 is pulled out and the welded PACK package is removed.

[0027] The battery cell combing device 2 plays the role of locating the battery cell position and combing the tab position for the first time, paving the way for the tab combing of the battery cell tab combing device 3; the battery cell combing device 2 also plays the role of supporting and positioning the PCB board and the battery cell tab combing device 3, and each battery cell guide comb tooth 22 serves as a support body for the PCB board to prevent the laser welding pressure head from pressing down to the PCB board 4 and bending, thereby affecting the welding quality.

[0028] The battery cell tab combing device 3 plays the role of locating the battery cell tab position and supporting and positioning the PCB board 4. The battery cell tab combing device 3 plays the role of locating the battery cell tab position accuracy through structural optimization design, simplifying the operator's tab insertion, and preventing the risks of short circuit, puncture, scratching, etc. caused by the bending of the tab due to inaccurate tab insertion.

[0029] The PACK package fixing device 1 includes a bottom plate 11, a door plate 12, and three side plates 13. The door plate 12 and the three side plates 13 are all vertically arranged above the bottom plate 11 and surround the periphery of the bottom plate 11. The three side plates 13 are fixedly connected to the bottom plate 11 by hexagon socket screws. One side wall of the door plate 12 is hinged to the adjacent side plate 13, and the other side wall is fixedly connected to the adjacent side plate 13 by a quick clamp fixing device 6. The bottom plate 11, door plate 12, and three side plates 13 all play the role of positioning and protecting the battery cells, facilitating the operation of the staff. After the overall assembly of the PACK package fixing device 1 is completed, multiple soft-pack battery cells 5 are manually placed into the PACK package fixing device 1 in sequence. The positive and negative poles of the soft-pack battery cells 5 need to be distinguished and grouped. Adjacent soft-pack battery cells 5 are fixedly connected using glue. After the soft-pack battery cells 5 are stacked, the door plate 12 is closed, and the force of the quick clamp fixing device 6 and the door plate 12 is used to achieve alignment and compression of the soft-pack battery cells 5. The aluminum tabs of the soft-pack battery cells 5 do not need to be wrapped with copper sheets, which facilitates operation, significantly reduces production costs, simplifies the manufacturing process, prevents metal foreign matter and welding slag from splashing into the battery cells, and improves product quality. Preferably, the base plate 11, door panel 12, and three side panels 13 are made of one of bakelite, ABS, PP, and PE, or existing insulating materials.

[0030] The bottom of the battery combing device 2 also includes two positioning legs 23, which are respectively located on both sides of the plurality of battery guide comb teeth 22. The positioning legs 23 include a positioning plate 231 and a positioning flange 232. The positioning flange 232 is fixed to one end of the positioning plate 231. The positioning plate 231 and the positioning flange 232 are respectively located on the outside of two adjacent side walls of the PACK package fixing device 1. The battery combing device 2 also includes a handle I 24, which is fixed to the back side of the plurality of battery guide comb teeth 22 to facilitate the insertion and removal of the battery combing device 2. The palm of a human hand holds the handle I 24, and the plurality of battery guide comb teeth 22 are aligned with the gap between the concave platforms at the upper end of the soft-pack battery cell 5 and inserted from the rear side panel. The positioning plates 231 on both sides guide the insertion process along the outer sides of the left and right side panels of the PACK package fixing device 1 until the positioning flanges fit against the rear side panel of the PACK package fixing device 1. The two positioning plates 231 serve to guide and position the battery core combing device 2 for insertion and removal.

[0031] The tooth end of each battery cell guide comb tooth 22 is provided with a guide structure. Preferably, the guide structure is a step structure 221, and the tooth end is provided with a chamfer Ⅰ 222; or the guide structure is a frustum structure or a cone structure, which facilitates the battery cell guide comb teeth 22 to be inserted into the gap between the battery cells and prevents the battery cells from being rubbed and damaged.

[0032] The cell tab combing device 3 also includes a handle II 33, which is fixed to the back side of several cell tab guide comb teeth 32 to facilitate the insertion and removal of the cell tab combing device 3. The handle II 33 is held by the palm of the hand, and the cell tab guide comb teeth 32 are aligned with the gaps between the tabs of the soft-pack battery cell 5. The handle II 33 is inserted from the rear side plate and fitted into the cell combing device 2 until the handle II 33 is aligned with the handle I 24.

[0033] The tooth ends of the cell tab guide comb teeth 32 are provided with chamfers II 321, which facilitate the cell tab guide comb teeth 32 to enter the gaps between the cell tabs and prevent the cell tab guide comb teeth 32 from rubbing against the cell tabs and thus damaging the cell tabs.

[0034] Nickel-plated copper busbars 42 are located between each pair of adjacent tab holes 41 on the PCB 4. Several nickel-plated copper busbars 42 are connected to data acquisition terminals 44 via printed circuits 43 on the PCB 4. The nickel-plated copper busbars 42 and data acquisition terminals 44 are attached to the PCB using a tinning, gold immersion, and carbon grinding process. The printed circuits 43 are tinned and copper-clad using a printing process. The PCB 4 penetrates the tab holes 41. The PCB 4 connects each soft-pack battery cell 5, facilitating series and parallel connection of the cells and collecting and outputting the cell voltage and temperature.

[0035] The two opposite side walls of the PACK fixing device 1 are fixed with handles 14 by hexagon socket screws, which facilitates overall transportation and coordination with the assembly line, making it suitable for mass production. The handles 14 are provided with limited convex edges, which conform to human mechanics and play a role in facilitating force bearing and preventing slipping.

[0036] The quick clamp fixing device 6 includes a quick clamp tension and compression body 61 and a quick clamp tension and compression hook 62. The quick clamp tension and compression hook 62 is fixedly mounted on the door panel 12. The quick clamp tension and compression body 61 is fixedly mounted on the side panel 13 adjacent to the door panel 12 via a cross pan head screw, and the quick clamp tension and compression body 61 and the quick clamp tension and compression hook 62 are correspondingly arranged. Preferably, a fixing plate 63 is fixedly mounted on the door panel 12 via a hexagon socket head screw, and the quick clamp tension and compression hook 62 is fixedly mounted on the fixing plate 63 via a cross pan head screw.

[0037] In order to meet the needs of various series and parallel combinations of the soft-pack battery cells 5 and their own strength, and to prevent the PCB board 4 from being compressed and bent, the battery cell guide comb teeth 22, the battery cell tab guide comb teeth 32, the copper nickel-plated copper busbars 41 of the PCB board 4 and the tab perforations 41 can be adjusted in number according to the battery cell position layout.

[0038] This soft package PACK laser welding process optimization and improvement device greatly saves production costs, simplifies manufacturing processes, improves product quality, and solves process problems such as solder molten beads piercing short circuits, welding slag splashing, PCB bending, and difficulty in piercing tabs. It also improves the laser welding process by relying on structural optimization.

[0039] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A device for optimizing and improving the laser welding process of a soft package PACK, characterized by: The invention comprises a PACK package fixing device (1), a battery cell combing device (2), a battery cell tab combing device (3) and a PCB board (4); the battery cell combing device (2) is provided with a PCB board positioning groove I (21) and a plurality of battery cell guide comb teeth (22), the PCB board positioning groove I (21) is located above the plurality of battery cell guide comb teeth (22), the battery cell tab combing device (3) is provided with a PCB board positioning groove II (31) and a plurality of battery cell tab guide comb teeth (32), the PCB board positioning groove II (31) is located above the plurality of battery cell tab guide comb teeth (32), a PACK package consisting of a plurality of soft-pack battery cells (5) arranged together is placed in the PACK package fixing device (1), fixed and pressed, the battery cell combing device (4) is provided with a PCB board positioning groove II (31) and a plurality of battery cell tab guide comb teeth (32), the PCB board positioning groove II (31) is located above the plurality of battery cell tab guide comb teeth (32), The device (2) is located above the PACK fixing device (1), and a plurality of cell guide comb teeth (22) are correspondingly inserted into the gap between two adjacent soft-packed cells (5); the cell tab combing device (3) is located above the cell combing device (2), and a plurality of cell tab guide comb teeth (32) are correspondingly inserted into the gap between the tabs of two adjacent soft-packed cells (5); the PCB board (4) is located in the PCB board positioning groove II (31), and the tabs of each soft-packed cell (5) are correspondingly inserted into the tab perforations (41) on the PCB board (4); the cell tab combing device (3) is pulled out, the PCB board (4) is moved down to the PCB board positioning groove I (21), the bent tabs are welded to the nickel-plated copper busbar (42) on the PCB board (4), and then the cell combing device (2) is pulled out.

2. The device for optimizing and improving the laser welding process of a soft package PACK according to claim 1, characterized in that: The PACK fixing device (1) comprises a bottom plate (11), a door plate (12) and three side plates (13), wherein the door plate (12) and the three side plates (13) are vertically arranged above the bottom plate (11) and enclosed around the bottom plate (11), and the three side plates (13) are fixedly connected to the bottom plate (11), one side wall of the door plate (12) is hinged to the adjacent side plate (13), and the other side wall is fixedly connected to the adjacent side plate (13) via a quick clamp fixing device (6).

3. The device for optimizing and improving the laser welding process of a soft package PACK according to claim 1, characterized in that: Two adjacent soft-pack battery cells (5) are fixedly connected using glue.

4. The device for optimizing and improving the laser welding process of a soft package PACK according to claim 1, characterized in that: The bottom of the battery combing device (2) further comprises two positioning legs (23), the two positioning legs (23) being respectively located on both sides of a plurality of battery guide comb teeth (22), the positioning legs (23) comprising a positioning plate (231) and a positioning flange (232), the positioning flange (232) being fixed to one end of the positioning plate (231), the positioning plate (231) and the positioning flange (232) being respectively located on the outer sides of two adjacent side walls of the PACK package fixing device (1), the battery combing device (2) further comprises a handle I (24), the handle I (24) being fixed to the back side of a plurality of battery guide comb teeth (22).

5. The device for optimizing and improving the laser welding process of a soft package PACK according to claim 1, characterized in that: The tooth end of each battery core guide comb tooth (22) is provided with a guide structure.

6. The device for optimizing and improving the laser welding process of a soft package PACK according to claim 1, characterized in that: The battery cell tab combing device (3) further comprises a handle II (33), wherein the handle II (33) is fixed on the back side of a plurality of battery cell tab guide comb teeth (32).

7. The device for optimizing and improving the laser welding process of a soft package PACK according to claim 1, characterized in that: The tooth ends of the battery cell tab guide comb teeth (32) are provided with chamfers II (321).

8. The device for optimizing and improving the laser welding process of a soft package PACK according to claim 1, characterized in that: A nickel-plated copper busbar (42) is provided between each two adjacent tab perforations (41) on the PCB board (4), and a plurality of nickel-plated copper busbars (42) are connected to a collection terminal (44) circuit via a printed circuit (43) on the PCB board (4).

9. The device for optimizing and improving the laser welding process of a soft package PACK according to claim 1, characterized in that: Handles (14) are fixedly provided on two opposite side walls of the PACK fixing device (1), and the handles (14) are provided with limited convex edges.

10. The device for optimizing and improving the laser welding process of a soft package PACK according to claim 2, characterized in that: The quick clamp fixing device (6) comprises a quick clamp tension and compression body (61) and a quick clamp tension and compression hook (62), wherein the quick clamp tension and compression hook (62) is fixedly arranged on the door panel (12), and the quick clamp tension and compression body (61) is fixedly arranged on the side panel (13) adjacent to the door panel (12), and the quick clamp tension and compression body (61) and the quick clamp tension and compression hook (62) are arranged correspondingly.

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